Backfire
Not too long ago a relative built a super efficient house. It was difficult finding a builder with related experience, but she found one and it is a very efficient house. Because the heat was considered to be electric, even though it would rarely come on, the generator guy said she needed 20+ KW. Very expensive, so she passed. Relatives were visiting when everybody lost power. Being efficient (panelized construction), everybody was warm enough. HA! They had to come to our house to shower and cook, 6 KW genset, traditional construction (1977).
"Your Engineered House" by Rex Roberts was the bible in the 70's. Lots of new tech now, but the basic concepts hold up.
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